The Substack studio report is a one-page truth serum. Use it before you optimize subject lines.
Free vs paid
If paid is under 5% but your content is written for buyers, the offer — not the writing — is the bottleneck.
Opens
Addresses with opens are your living list. Resolve them first; they burn fewer enrichment credits per insight.
Next send
- Write one issue aimed at the paid/core pocket
- Suppress or re-permission the never-opened cohort
- Schedule a lookalike pass on champions only
Run this on your own list.